Remove pip_lock_down dependency

The pip_install and pip_lock_down roles have been merged.

Remove pip_lock_down from the role's meta dependencies and test
requirements.

Change-Id: I234245405f0cfc64c9ed9eb31783e49437917721

meta/main.yml

@@ -18,7 +18,7 @@ galaxy_info:
   description: Installation and setup of Zaqar
   company: OpenStack
   license: Apache2
-  min_ansible_version: 1.6.6
+  min_ansible_version: 1.9
   platforms:
     - name: Ubuntu
       versions:
@@ -31,11 +31,5 @@ galaxy_info:
     - development
     - openstack
 dependencies:
-  - role: pip_lock_down
-    when:
-      - not zaqar_developer_mode | bool
-      - not zaqar_local_mode | bool
-  - role: pip_install
-    when:
-      - zaqar_developer_mode | bool or zaqar_local_mode | bool
+  - pip_install
   - memcached_server

tests/ansible-role-requirements.yml

@@ -6,10 +6,6 @@
   src: https://git.openstack.org/openstack/openstack-ansible-pip_install
   scm: git
   version: master
-- name: pip_lock_down
-  src: https://git.openstack.org/openstack/openstack-ansible-pip_lock_down
-  scm: git
-  version: master
 - name: lxc_hosts
   src: https://git.openstack.org/openstack/openstack-ansible-lxc_hosts
   scm: git